High CPU temperature and high fans level

[David Demelier]

Le 18/07/2016 15:41, Ian Smith a écrit :
> In freebsd-questions Digest, Vol 632, Issue 8, Message: 21
> On Sun, 17 Jul 2016 11:59:32 +0200 David Demelier <demelier.david at gmail.com> wrote:
>   > 2016-07-17 0:25 GMT+02:00 Polytropon <freebsd at edvax.de>:
>   > > On Sun, 17 Jul 2016 00:06:07 +0200, David Demelier wrote:
>   > >> Hello,
>   > >>
>   > >> I was trying FreeBSD 10.3 on my laptop (hp probook 4510s) and was surprised
>   > >> to see high CPU temperature and fans running high.
>   > >>
>   > >> No apps running, I get a temperature of 57C in dev.cpu.x.temperature and
>   > >> fans run high (not able to get rpms).
>   > >>
>   > >> On a 4.6.3 Linux distro I get an average of 48C and fans are quite low.
>   > >>
>   > >> Both tests were kept in tty. No Xorg running just a boot and user login in
>   > >> console.
>   > >>
>   > >> Do you have any clue?
>   > >
>   > > Did you enable powerd? It can slow down the CPU when the system
>   > > is idle, and increase the CPU speed when needed. This should have
>   > > an effect on CPU temperature and fan speed.
>
>   > Yes, I had powerd enabled, I tried -a adaptive, -a hiadaptive as
>   > suggested by Erich but it seems that only -a min has some little
>   > effect. I could get a temperature of 52C. I've tested back on Linux
>   > and I got an average much lower (41C).
>
> We really need to see what speed the CPU is running at when idle.
>
> I think the fans running high - presumably from the sound and airflow? -
> rules out the sort of sensor errors Arthur reported (ie below ambient :)
> and I assume the box actually feels warmer .. 57C suggests a busy CPU or
> two .. but then it is summer there; what background ambient temp. range?

We have air-conditioning at work so ambient temperature is normal, 
somewhat between 24-28.

>
>   > By the way the other sensors in hw.acpi.tz* are also much higher than
>   > Linux (using lm_sensors). The highest value is my tz5 which is at 78C
>   > almost 5 seconds after boot while the maximum tz value in Linux
>   > sensors is 55.
>   >
>   > I have no idea what's wrong. :(
>
> Normally I'd suggest posting this to freebsd-mobile@ as it's not been
> such an uncommon issue, especially with some makes/models, but you could
> try showing these to see if anyone spots something strange:
>
>   % sysctl hw.acpi
>   % sysctl debug.acpi
>   % sysctl dev.est	# assuming intel? if not, maybe dev.hwpstate?
>   % sysctl dev.cpu	# best while idle, maybe plus when busier
>

Thanks for your answer, here I posted the output of the sysctl variables 
you asked for:

http://markand.fr/files/result.txt

I've ran them on a FreeBSD memstick, I needed to install a Linux distro 
until I can find a solution because this drains my battery a lot.

The average temperature was 50C, a bit less than the installed version 
on hard drive where I have seen higher values. This is interesting. I 
will double check if something else makes the CPU more busy.

Regards,

-- 
David Demelier